CVE-2016-2803 [Medium] | XSS in Bugzilla

CVE-2016-2803 is rated Moderate Risk (44.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.39%). Review affected assets and schedule remediation.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-03-30	0.32%	0.39%	+0.07%
2	2025-03-29	0.39%	0.32%	-0.07%
3	2025-03-17	—	0.39%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-03-30

0.32%

0.39%

+0.07%

2025-03-29

0.39%

0.32%

-0.07%

2025-03-17

—

0.39%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
6.1	3.0	MEDIUM	`CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	2.8	2.7	[email protected]
4.3	2.0	MEDIUM	`AV:N/AC:M/Au:N/C:N/I:P/A:N` Click to expand Access vector (AV:N) Can be exploited remotely over network reachability. Access complexity (AC:M) Exploitation needs some favorable conditions, but not exceptional ones. Authentication (AU:N) No authentication is required. Confidentiality impact (C:N) No confidentiality impact. Integrity impact (I:P) Partial integrity impact. Availability impact (A:N) No availability impact.	8.6	2.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

6.1

3.0

MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R): A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C): Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L): Some sensitive info could get out, but not a total data dump.
Integrity (I:L): Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N): Service keeps running; no real outage angle.

2.8

2.7

[email protected]

4.3

2.0

MEDIUM

AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand

Access vector (AV:N): Can be exploited remotely over network reachability.
Access complexity (AC:M): Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N): No authentication is required.
Confidentiality impact (C:N): No confidentiality impact.
Integrity impact (I:P): Partial integrity impact.
Availability impact (A:N): No availability impact.

8.6

2.9

[email protected]

Affected software / configurations for CVE-2016-2803

Vendor	Product	Version	Raw CPE
mozilla	bugzilla	2.2	cpe:2.3:a:mozilla:bugzilla:2.2:::::::*
mozilla	bugzilla	2.4	cpe:2.3:a:mozilla:bugzilla:2.4:::::::*
mozilla	bugzilla	2.6	cpe:2.3:a:mozilla:bugzilla:2.6:::::::*
mozilla	bugzilla	2.8	cpe:2.3:a:mozilla:bugzilla:2.8:::::::*
mozilla	bugzilla	2.9	cpe:2.3:a:mozilla:bugzilla:2.9:::::::*
mozilla	bugzilla	2.16	cpe:2.3:a:mozilla:bugzilla:2.16:rc1::::::
mozilla	bugzilla	2.16	cpe:2.3:a:mozilla:bugzilla:2.16:rc2::::::
mozilla	bugzilla	2.16.1	cpe:2.3:a:mozilla:bugzilla:2.16.1:::::::*
mozilla	bugzilla	2.16.2	cpe:2.3:a:mozilla:bugzilla:2.16.2:::::::*
mozilla	bugzilla	2.16.3	cpe:2.3:a:mozilla:bugzilla:2.16.3:::::::*
mozilla	bugzilla	2.16.4	cpe:2.3:a:mozilla:bugzilla:2.16.4:::::::*
mozilla	bugzilla	2.16.5	cpe:2.3:a:mozilla:bugzilla:2.16.5:::::::*
mozilla	bugzilla	2.16.6	cpe:2.3:a:mozilla:bugzilla:2.16.6:::::::*
mozilla	bugzilla	2.16.7	cpe:2.3:a:mozilla:bugzilla:2.16.7:::::::*
mozilla	bugzilla	2.16.8	cpe:2.3:a:mozilla:bugzilla:2.16.8:::::::*
mozilla	bugzilla	2.16.9	cpe:2.3:a:mozilla:bugzilla:2.16.9:::::::*
mozilla	bugzilla	2.16.10	cpe:2.3:a:mozilla:bugzilla:2.16.10:::::::*
mozilla	bugzilla	2.16.11	cpe:2.3:a:mozilla:bugzilla:2.16.11:::::::*
mozilla	bugzilla	2.16_rc2	cpe:2.3:a:mozilla:bugzilla:2.16_rc2:::::::*
mozilla	bugzilla	2.17	cpe:2.3:a:mozilla:bugzilla:2.17:::::::*
mozilla	bugzilla	2.17.1	cpe:2.3:a:mozilla:bugzilla:2.17.1:::::::*
mozilla	bugzilla	2.17.2	cpe:2.3:a:mozilla:bugzilla:2.17.2:::::::*
mozilla	bugzilla	2.17.3	cpe:2.3:a:mozilla:bugzilla:2.17.3:::::::*
mozilla	bugzilla	2.17.4	cpe:2.3:a:mozilla:bugzilla:2.17.4:::::::*
mozilla	bugzilla	2.17.5	cpe:2.3:a:mozilla:bugzilla:2.17.5:::::::*
mozilla	bugzilla	2.17.6	cpe:2.3:a:mozilla:bugzilla:2.17.6:::::::*
mozilla	bugzilla	2.17.7	cpe:2.3:a:mozilla:bugzilla:2.17.7:::::::*
mozilla	bugzilla	2.18	cpe:2.3:a:mozilla:bugzilla:2.18:::::::*
mozilla	bugzilla	2.18	cpe:2.3:a:mozilla:bugzilla:2.18:rc1::::::
mozilla	bugzilla	2.18	cpe:2.3:a:mozilla:bugzilla:2.18:rc2::::::
mozilla	bugzilla	2.18	cpe:2.3:a:mozilla:bugzilla:2.18:rc3::::::
mozilla	bugzilla	2.18.1	cpe:2.3:a:mozilla:bugzilla:2.18.1:::::::*
mozilla	bugzilla	2.18.2	cpe:2.3:a:mozilla:bugzilla:2.18.2:::::::*
mozilla	bugzilla	2.18.3	cpe:2.3:a:mozilla:bugzilla:2.18.3:::::::*
mozilla	bugzilla	2.18.4	cpe:2.3:a:mozilla:bugzilla:2.18.4:::::::*
mozilla	bugzilla	2.18.5	cpe:2.3:a:mozilla:bugzilla:2.18.5:::::::*
mozilla	bugzilla	2.18.6	cpe:2.3:a:mozilla:bugzilla:2.18.6:::::::*
mozilla	bugzilla	2.18.6\+	cpe:2.3:a:mozilla:bugzilla:2.18.6\+:::::::*
mozilla	bugzilla	2.18.7	cpe:2.3:a:mozilla:bugzilla:2.18.7:::::::*
mozilla	bugzilla	2.18.8	cpe:2.3:a:mozilla:bugzilla:2.18.8:::::::*
mozilla	bugzilla	2.18.9	cpe:2.3:a:mozilla:bugzilla:2.18.9:::::::*
mozilla	bugzilla	2.19	cpe:2.3:a:mozilla:bugzilla:2.19:::::::*
mozilla	bugzilla	2.19.1	cpe:2.3:a:mozilla:bugzilla:2.19.1:::::::*
mozilla	bugzilla	2.19.2	cpe:2.3:a:mozilla:bugzilla:2.19.2:::::::*
mozilla	bugzilla	2.19.3	cpe:2.3:a:mozilla:bugzilla:2.19.3:::::::*
mozilla	bugzilla	2.20	cpe:2.3:a:mozilla:bugzilla:2.20:::::::*
mozilla	bugzilla	2.20	cpe:2.3:a:mozilla:bugzilla:2.20:rc1::::::
mozilla	bugzilla	2.20	cpe:2.3:a:mozilla:bugzilla:2.20:rc2::::::
mozilla	bugzilla	2.20.1	cpe:2.3:a:mozilla:bugzilla:2.20.1:::::::*
mozilla	bugzilla	2.20.2	cpe:2.3:a:mozilla:bugzilla:2.20.2:::::::*
mozilla	bugzilla	2.20.3	cpe:2.3:a:mozilla:bugzilla:2.20.3:::::::*
mozilla	bugzilla	2.20.4	cpe:2.3:a:mozilla:bugzilla:2.20.4:::::::*
mozilla	bugzilla	2.20.5	cpe:2.3:a:mozilla:bugzilla:2.20.5:::::::*
mozilla	bugzilla	2.20.6	cpe:2.3:a:mozilla:bugzilla:2.20.6:::::::*
mozilla	bugzilla	2.20.7	cpe:2.3:a:mozilla:bugzilla:2.20.7:::::::*
mozilla	bugzilla	2.21	cpe:2.3:a:mozilla:bugzilla:2.21:::::::*
mozilla	bugzilla	2.21.1	cpe:2.3:a:mozilla:bugzilla:2.21.1:::::::*
mozilla	bugzilla	2.21.2	cpe:2.3:a:mozilla:bugzilla:2.21.2:::::::*
mozilla	bugzilla	2.21.2	cpe:2.3:a:mozilla:bugzilla:2.21.2:rc1::::::
mozilla	bugzilla	2.22	cpe:2.3:a:mozilla:bugzilla:2.22:::::::*
mozilla	bugzilla	2.22	cpe:2.3:a:mozilla:bugzilla:2.22:rc1::::::
mozilla	bugzilla	2.22.1	cpe:2.3:a:mozilla:bugzilla:2.22.1:::::::*
mozilla	bugzilla	2.22.2	cpe:2.3:a:mozilla:bugzilla:2.22.2:::::::*
mozilla	bugzilla	2.22.3	cpe:2.3:a:mozilla:bugzilla:2.22.3:::::::*
mozilla	bugzilla	2.22.4	cpe:2.3:a:mozilla:bugzilla:2.22.4:::::::*
mozilla	bugzilla	2.22.5	cpe:2.3:a:mozilla:bugzilla:2.22.5:::::::*
mozilla	bugzilla	2.22.6	cpe:2.3:a:mozilla:bugzilla:2.22.6:::::::*
mozilla	bugzilla	2.22.7	cpe:2.3:a:mozilla:bugzilla:2.22.7:::::::*
mozilla	bugzilla	2.23	cpe:2.3:a:mozilla:bugzilla:2.23:::::::*
mozilla	bugzilla	2.23.1	cpe:2.3:a:mozilla:bugzilla:2.23.1:::::::*
mozilla	bugzilla	2.23.2	cpe:2.3:a:mozilla:bugzilla:2.23.2:::::::*
mozilla	bugzilla	2.23.3	cpe:2.3:a:mozilla:bugzilla:2.23.3:::::::*
mozilla	bugzilla	2.23.4	cpe:2.3:a:mozilla:bugzilla:2.23.4:::::::*
mozilla	bugzilla	3.0	cpe:2.3:a:mozilla:bugzilla:3.0:::::::*
mozilla	bugzilla	3.0	cpe:2.3:a:mozilla:bugzilla:3.0:rc1::::::
mozilla	bugzilla	3.0.0	cpe:2.3:a:mozilla:bugzilla:3.0.0:::::::*
mozilla	bugzilla	3.0.1	cpe:2.3:a:mozilla:bugzilla:3.0.1:::::::*
mozilla	bugzilla	3.0.2	cpe:2.3:a:mozilla:bugzilla:3.0.2:::::::*
mozilla	bugzilla	3.0.3	cpe:2.3:a:mozilla:bugzilla:3.0.3:::::::*
mozilla	bugzilla	3.0.4	cpe:2.3:a:mozilla:bugzilla:3.0.4:::::::*

References for CVE-2016-2803

URL	Tags
http://packetstormsecurity.com/files/137079/Bugzilla-4.4.11-5.0.2-Summary-Cross-Site-Scripting.html	Third Party Advisory VDB Entry
http://www.securityfocus.com/archive/1/538401/100/0/threaded
http://www.securitytracker.com/id/1035891	Third Party Advisory VDB Entry
https://www.bugzilla.org/security/4.4.11/	Issue Tracking Third Party Advisory VDB Entry

URL

CVE-2016-2803

Exploit prediction scoring system (EPSS) score for CVE-2016-2803

Common vulnerability scoring system (CVSS) metrics for CVE-2016-2803

Weakness enumeration for CVE-2016-2803

Affected software / configurations for CVE-2016-2803

References for CVE-2016-2803